Tube-stripping apparatus



April 2, 1929. M. PADE 1,707,640

TUBE STRI PP ING APPARATUS Filed Sept. 10, 1926 2 Sheets-Sheet 2 INVENTOR. fill/z P40:

A TTORNE Y.

Patented Apr. 2, 1929.

MAX H. PADE, OF AKRON, OHIQ,

ASSIGNOR TO COMPANY, or AKRON, OHIO, A

THE IIRESTONE'TIRE CORPORATION or orno,

IUBE- STRIPPING APPARATUS.

V a ncauoii filed September 10, 1926. serial No. 134,642.-

This invention relates to tube stripping apparatus for use in rubber factories.

The general purpose ofthe invention is to provide an improved apparatus for use in stripping rubber tubes such as inner tubes from the hollow mandrels upon which they are formed or vulcanized.

Heretofore, the general practice has been to perform this operation manually, two operatives being employed, one reversely strip. ping the tube from the mandrel with the aid of an air pressure nozzle and the other holding the mandrel and plugging the end thereof opposite tothat from which the tube is withdrawn to maintain the air pressure within the tube.

Various devices have been proposed to re duce the labor and expense incident to tube stripping operations but no device has heretofore been provided which is universally operable upon all sizes of mandrels. More over certain of these prior devices have de pended upon the use of plugged mandrels.

Plugging of the mandrels is disadvantageous in that certain vulcanization processes depend upon circulation of the curing medium through the mandrel.

The invention particularly has for its ob ject the provision of a stripping apparatus which will enable a single operative to perform the stripping operation without the use of plugged mandrels;

The foregoing and other objects are ob-. tained by the construction illustrated in the accompanying drawings and described below. It is to be understood that the inven-. tion is not limited to the specific form there of shown and described. 7 I

' Of the accompanying drawings:

Figure 1 is a side elevation of stripping apparatus embodying the invention; a

Figure 2 is a transverse section through the stripping apparatus illustrating the first stripping operation; and

Figure 3 is an end elevation thereof illus-- trating the second stripping operation.

Referring to the drawings, 10 indicates a supply conveyor of a known type for delivering of hollow mandrels 11, 11 having tubes 12,12 thereon to the stripping apparatus indicated generally by the numeral 13. r

This a paratus comprises a suitable supporting frame 14 having mounted thereon a lower clamping bar 15 provided with a v15 as a pivot.

ing bars 15 and end of mandrelseat 16 and an upper clamping bar 17 off-set rearwardly from bar 15 and havmg an opposed seat 18.- Bar 17 is adjustable on posts 19, 19 secured on frame 14, springs 20, 20 being arranged to urge bar 17 upwardly andwing-nuts 21, 21 being threaded upon posts 19 to adjust the bar 17 downwardly against the actions of springs 20. By the above arrangement, the end of a mandrel 11 may be inserted between the clamping bars and the whole mandrel is supported free with the exception of said end, the weight of the mandrel serving to hold it in place by the tendency of its free portion to rock the mandrel downwardl Positive clamping of each is thus avoided.

aced on frame 14 rearwardly of clamp- 17 is a plugging device ind cated generally by the numeral 22 and compr s ng a substantially conical plug 23 of resilient material such as rubber supmandrel in place ported on a rod 24 so as to be in alignment 7 with a mandrel 11' inserted between members 15 and 17 whereby the end of a mandrel may be urged against the plug, the conical end of the latter entering the end of the mandrel. Rod 24 is reciprocable in bearings 25, 25 and a spring 26 is arranged to urge the plug 23 AND RUBBER about bar forwardly. Accordingly the plug 23 is.

yieldable rearwardly under the action of the a mandrel thereagainst, the spring 26 maintaining the plug with sealing pressure against the end of a mandrel; V

In use, the stripping operative removes a mandrelfrom conveyor 10 and inserts an end thereof between members 15 and 17 as illustrated in Figure 2. This holds the mandrel so that he can then reversely strip the tube using the air nozzle 27 in the usual, way until the reversely stripped portion extends to the other end of the mandrel.

to prevent the air from the nozzle blowing throughthe mandrel, the latter is lifted slightly plug 23 abling the operative to complete the stripping operation as illustrated in Fi re 3.

It willappear that the mandrel is held in bothstripping positions by its own weight and can be easily inserted, moved from one and shoved into engagement with sealing the mandrel and thus en- Then, in order Y position to the otherfand removed from the machine by a, sin

1e strippin operative. Modifications o the invent on may be resorted to without departing from the spirit thereozt' or the scope "of theappend'ed claims.

W'hatis c'laim'edisfi 1 1. Apparatus for use apparatus comand lower clamping bars therebetween and to clamp said lnandrel in place by the reactioiioif the weight Of the free portion of the mandrel therein and a 'yi'eldably 'ineunted plug line fi iththe end V in stripping-rubbertubes from mandrels eaid fp'fismg in combination offset-relatively ad; justa-ble upper adaptedto receive the endef amandrel a mandrel therebetween and to clamp said =1nandre1 in place by the reaction of the 20 prising in combination upper and lower clamping bars-adapted to receive the endoi Weight of the free portion of the mandrel tlfei'eim and a wince-1 plug in line with the end of a Illill'ldl'flllllSQlt-Bd between saidbars.

I H. FADE. 

